江苏近海有色可溶有机物时空分布特征

发布时间：2018-07-03 00:32

本文选题：有色可溶有机物(CDOM) + 静止水色卫星(GOCI)　；参考：《地球科学进展》2017年05期

【摘要】：有色可溶有机物(CDOM)是重要的水色要素之一,在"江苏沿海大开发"背景下,利用遥感分析其时空分布特征对监测近海水质及污染状况有重要的实际意义。用高时间分辨率的韩国静止水色卫星(GOCI)影像,在日、周、月多时间尺度上分析2011年4月至2016年5月江苏近海有色可溶有机物的时空分布特征。结果表明江苏近海CDOM以陆源为主,近岸高于远岸;月平均浓度最大值(0.180~0.206 m~(-1))在长江口最大浑浊带外,南黄海西岸次之(0.167~0.201 m~(-1)),南黄海中南部较低(0.086~0.187 m~(-1),440 nm吸收系数)。结合潮位数据,发现沿岸海域CDOM日变化与潮汐变化一致,但远海区域呈先减后增的特征。利用余弦函数对CDOM月均值进行拟合,发现南黄海月尺度变化周期性明显,其中南黄海中部海域拟合优度为0.823。南黄海主要受黄海冷水团影响,各子区季节变化显著,CDOM在冬春季高于夏秋季;长江口由于冲淡水及其他水团共同影响,情况复杂,冬春季低于夏秋季。月尺度下,CDOM浓度与悬浮物(TSM)呈正相关关系(相关系数r为0.72),且南黄海中部与南部CDOM随TSM的变化趋势较为显著。
[Abstract]:The color soluble organic matter (CDOM) is one of the important water color elements. Under the background of "Jiangsu coastal development", it is of great practical significance to use remote sensing to analyze the spatial and temporal distribution of CDOM for monitoring the offshore water quality and pollution status. The temporal and spatial distribution characteristics of colored soluble organic matter in Jiangsu coastal waters from April 2011 to May 2016 were analyzed on the scale of day, week and month with high temporal resolution Korea static water color satellite (GOCI) image. The results show that the continental origin is dominant in the coastal area of Jiangsu, and the maximum monthly mean concentration (0.180 ~ 0.206 m ~ (-1) is higher in the nearshore than in the far shore, and the second is in the west bank of South Huang Hai (0.167 ~ 0.201 m ~ (-1),) (0.086 0.187 m ~ (-1) 440nm absorption coefficient). Based on the tidal level data, it is found that the diurnal variation of CDOM in coastal waters is consistent with the tidal variation, but the far-sea area shows the characteristics of first decreasing and then increasing. Using cosine function to fit the monthly mean value of Huang Hai, it is found that the monthly scale variation of South Huang Hai is obvious, and the goodness of fit in the middle of South Huang Hai is 0.823. The south Huang Hai is mainly affected by Huang Hai cold water mass, and the seasonal variation of Huang Hai in each sub-region is significantly higher in winter and spring than in summer and autumn, and the situation of Yangtze Estuary is complex because of the influence of diluted water and other water masses, which is lower in winter and spring than in summer and autumn. There was a positive correlation between the concentration of Huang Hai and suspended solids (r = 0. 72) in monthly scale.
【作者单位】：南京大学地理与海洋科学学院;
【基金】：国家自然科学基金项目“冰雷达与卫星测高协同的南极冰下湖遥感识别研究”(编号:41371391) 国家重点研发计划项目“海洋气候数据集生成与分析”(编号:2016YFA0600102)资助~~
【分类号】：P734;X55

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